Screw nut



FIG. 1 is a side view of a short version of the screw nut of the present invention;

FIG. 2 is a top view of the short version of the screw nut of the present invention;

FIG. 3 is a perspective view of the short version of the screw nut of the present invention;

FIG. 4 is a side view of a medium length version of the screw nut of the present invention;

FIG. 5 is a top view of the medium length version of the screw nut of the present invention; and,

FIG. 6 is a perspective view of the medium length version of the screw nut of the present invention. 

The ornamental design for a screw nut, as shown and described. 